Brief communication. Integrable electronically tunable oscillator

Altaf, Talat; Khan, Rehman Ahmad

doi:10.1080/00207219008921201

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…In some cases, such as music synthesis, speech synthesis, and authomatic control, the electronic/digital control of filter parameters is generally required. It is now well known that operational transconductance amplifiers (OTAs) can be utilized for the realization of active filters and oscillators with electronic tunability (Sinencio et al 1988, Malvar 1982, Altaf and Khan 1990, Altaf and Singh 1991. The tunability being achieved through the extra control terminals are easily interfaced by means of digital circuits.…”

Section: Introductionmentioning

confidence: 99%

Microprocessor-controlled OTA-C lowpass and bandpass filters

Altaf¹,

Singh²

1991

International Journal of Electronics

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A realization scheme is given of a high input impedance active biquadratic filter circuit which simultaneously gives lowpass and bandpass responses using operational transconductance amplifiers and capacitors (OTA-C). The circuit basically uses two programmable integrators (PIs) and an additional OTA. Microprocessor control of the pole frequency (w o ) and pole-Q (Q) of the filter is achieved by employing a Motorola 68000 microprocessor and peripheral devices. Electronic control of the filter parameters is also available through the OTAs bias currents. The circuit has excellent sensitivity performance and is suitable for implementation in CMOS-technology. The circuit is attractive for applications in music synthesis, speech synthesis, automatic control, etc. where electronic/digital control of the filter parameters is required. Experimental results on the discrete version of the circuit are included.

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Section: Introductionmentioning

confidence: 99%